Improvement in valve-gears



-NITED STATES PATENT OEEIcE.

WILLIAM L. NEWSHAM, OF PHILADELPHIA, PENNSYLVANIA.

IMPROVEMENT IN VALVE-GEARS.

Specification forming part of Letters Patent No. 1 64,865, dated June 22, 1875 application filed May 11, 1875.

To all 'uhom it may concern:

Be it known that I, WILLIAM L. NEWSHAM, of the city and county of Philadelphia, in the State of Pennsylvania,have invented an Automatic Safety-Trip for Corliss SteamEngines, of which the following is a specification:

The nature of my invention consists in disconnecting the valve-rod lifters from the rods when the governor is disarranged, by the combination of the governor-le\-'er with the lower end of the valve-rod lifters, in such a manner that when the governor-balls drop, carrying the long arms of the'lever down ward, and consequently the short arms away from the valve-rod lifters, whereby their connection with the rods would be continued, the movement of the above-mentioned connecting device so changes the position of said litters as to break their connection with the rods as to close the valves. The connectionis made with the lower ends of the lifters by means of additional arms of the lever, in combination with extensions of the lower ends of the lifters.

In the accompanying drawings, Figure l is a plan view of the governor-lever I and parts in connection, showing my improvement. Fig. 2 is a side elevation of the same.

Like letters of reference in the figures indi cate the same parts.

A is a bed-plate, which has uprights B B for the connection of the valve-rods O G and the support-of the rock-shaft D, which has bearings therein. The rock-shaft has eccentrics E E for operating the cradles F F, that are hung at one end on the joint-rod a, for operating the valve-rods by meansof the lift ers G G, hung on' the front ends of the cradles by means of the joint-pins b I). This arrangement for operating the lifters for the movement of the valve-rods is merely for the sake of illustration. In practice other mechanism is used. H H are counterweights of the lift ers, for bringing them into connection with the lower ends of the valve-rods, I is the governor-lever, hung on the rod J, and connected with the governor-slide K. The lever has arms 0 G, which operate the litters. Be-

close the valves until the derangement of the governor ,is corrected. Instead of the combination of the arms (I d with the extensions 0 c of the lifters, a bell-crank, L, may be connected with the lever I, and the upper ends of the levers by means of wires g and g g, as shown by dotted lines. 7

The above description applies to an upright engine. A like arrangement would be used for a horizontal engine, the positions of the parts being changed accordingly.

As lifters are made in various forms, corresponding changes will have to be made in the tripping device to suit them.

I claim as my invention- The combination of the lever I, having arms 0 c and d d, Withthe lifters G G, having extensions e 0, whereby to trip the lifters, when the lever is caused to drop by a derangement of the governor,and'thus to disconnect the lifters from the valverods' and close the valves, substantially as set forth.

WILLIAM L. NEWSHAM.

STEPHEN UsrIcK. 

